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FM 6-75 MHI Copy 3 WAR DEPARTMENT FIELD ARTILLERY FIELD MANUAL SERVICE OF THE PIECE 15MM HOWMlEtR M2, TRUCK-DRAWN December 12, 1941 L1~~~~~~~~~~ .I

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  • FM 6-75MHICopy 3

    WAR DEPARTMENT

    FIELD ARTILLERYFIELD MANUAL

    SERVICE OF THE PIECE

    15MM HOWMlEtR M2, TRUCK-DRAWN

    December 12, 1941

    L1~~~~~~~~~~ .I

  • FM 6-75

    FIELD ARTILLERYFIELD MANUAL

    SERVICE OF THE PIECE105-NMM HOWITZER, M2, TRUCK-DRAWN

    Prepared under direction of theChief of Field Artillery

    UNI'IED STATES

    GOVERNMENT PRINTING OFFICE

    WASHINGTON : 1941

    For sale by the Superintendent of Documents. Washington, D.C.

  • WAR DEPARTMENT,WASHINGTON, December 12, 1941.

    FM 6-75, Field Artillery Field Manual, Service of the

    Piece-105-mm Howitzer M2, Truck-drawn, is published for

    the information and guidance of all concerned.

    [A. G. 062.11 (10-14-41).]

    BY ORDER OF THE SECRETARY OF WAR:

    G. C. MARSHALLIChzef of Staff.

    OFFICIAL:

    E. S. ADAMS,Major General,

    The Adjutant General.

    DISTRIBUTION:

    Bn and H 6 (4); IB 6 (10); IR 6 (6); IBn 6 (7);

    IC 6 (16); IC and H 9 (2).(For explanation of symbols see FM 21-6.)

  • TABLE OF CONTENTS

    SECTION I. General. Paragraph PagePurpose and scope -________________ 1References --- ____________________ 2 1Definitions and terms - -_____________ 3 1

    II. Organization.Composition--______________ -_- - ___ 4 2Formation --______________________ 5 2

    III. Posts: Mounting and dismounting.Posts of howitzer squad --___________ 6 3To post howitzer squads___________ - - 7 3Posts of cannoneers______________ - -8 3To post cannoneers --_________ ____ 9 4To mount --_______________________ 10 4To dismount --_____________________ 11 6

    IV. Movements of the carriages by hand.Coupled_________________________ - -12 7Uncoupled________________________ 13 7

    V. Uncoupling and coupling.Uncoupling______________________ - -14 9Coupling-----_____________________ 15 10

    VI. Prepare for action and march order.To prepare for action --_________ _ 16 10Posts of cannoneers,. piece un-

    coupled - -_________________________ 17 13March order_____________________ - -18 14

    VII. Duties in firing.General - -__________-_-___._______ 9 17Chief of section --_________________ 20 17Gunner _____________--____________ 21 22No. 1 -____-_-____ --__-_-_- ________ 22 26No. 2-________________-__-___-- -___ 23 29No.3___________ -_____-___-_______ 24 30No. 4 ---------------------------- 25 31No. 5 ---______________-______ -____ 26 31No. 6--_____----------------------- 27 32No. 7 --_____________________________ 28 32

    VIII. Additional information on the service ofthe piece.

    Accuracy in laying---______________ 29 33Fire at will-________________-__--_ 30 33Aiming posts --____________________ 31 34Displacement correction--___________ 32 34Reporting errors --_________________ 33 34Cease firing --------- -_____________ 34 35Suspend firing --___________________ 35 35Change in data during firing ------ 36 35To unload piece__________________ - -37 35Misfires_________________________ - -38 36Ammunition - -____________________ 39 36Section data board------___________ 40 36

    II

  • TABLE OF CONTENTS

    Paragraph PageSEcrTON IX. Care and maintenance of materiel.

    General ---------------------.---- 41 37Inspection ------------------------ 42 38Cleaning -_-------_----__---------- 43 38Lubrication -___------------_------ 44 39Protection against chemicals __---- 45 41Recoil mechanism ___----___------ 46 42Barrel assembly and slides__________ 47 45Breech and firing mechanisms______ 48 47Equilibrator ___-__---------------- 49 49Elevating mechanism and cradle

    trunnion bearings-________------- 50 50Wheels and wheel bearings -_______ 51 50Brake mechanism -_________-------- 2 52Sighting and fire-control equip-

    ment __-_________________------ 53 53

    Iv

  • FM 6-75

    FIELD ARTILLERY FIELD MANUAL

    SERVICE OF THE PIECE

    105-MM HOWITZER, M2, TRUCK-DRAWN

    SECTION I

    GENERAL

    E 1. PURPOSE AND SCOPE.-This manual prescribes the duties tobe performed in the service of the piece by the personnelnormally assigned to one howitzer section of the firingbattery.

    * 2. REFERENCES.-a-C. Description, operation, functioning, andcare of materiel.-TM 9-325; SNL C-21.

    b. Description and operation of fire-control and sightingequipment.-TM 9-325; SNL F-1.

    c. Ammunition.-TM 9-325; TM 9-1900; SNL R-1.d. Cleaning and preserving materials.-TM 9-850; SNL K-1.e. Automotive driver.-FAM 25-10.f. Maneuvers of battery.-Part Two, FM 6-5.g. Safety precautions in firing.-AR 750-10; FP 6-40.h. Firing battery.-FM 6-40.i. Gunnery.-FM 6-40.j. Reconnaissance, occupation, and organization of posi-

    tion.-FM 6-20.

    N 3. DEFINITIONS AND TERMS.-a. Section.-Tables of Organi-zation prescribe the personnel and materiel comprising a sec-tion of a battery. In this manual the term is frequently usedto designate a section of the firing battery. In this restrictedsense, a howitzer section is composed of one piece and theadditional materiel and the personnel required to serve thatpiece.

    b. Coupled.-A piece is said to be coupled when its lunetteis attached to the pintle of a truck or other prime mover.

    c. Uncoupled.-A piece is said to be uncoupled when itslunette is detached from the pintle of a truck or other primemover and the trail rests on the ground.

    d. Front.-The front in a section, carriages coupled, is thedirection in which the trail points; carriages uncoupled, thedirection in which the muzzle of the piece points.

  • 3-5 FIELD ARTILLERY

    e. Right (left) .-The direction right (left) is the right (left)of one facing the front.

    f. In battery.-A howitzer is said to be in battery when itis in its normal firing position.

    SECTION II

    ORGANIZATION

    4. COMPOSITION.-a. Howitzer squad.-A howitzer squadconsists of the gunner and seven cannoneers numbered from1 to 7.

    b. Howitzer section.-A howitzer section consists of a chiefof section, a howitzer squad, a driver, and additional can-noneers and an assistant driver who may be assigned orattached. The additional cannoneers act as reliefs or areassigned to other duties as the chief of section may direct.When the section uncouples for drill or for firing, the chiefof section remains at the position of the piece and commandsthe howitzer squad.

    c. Ammunition squad.-(1) An ammunition squad consistsof an ammunition corporal and cannoneers as prescribedin Tables of Organization. These cannoneers are numberedconsecutively, beginning with No. 1, and are assigned to theammunition vehicles of the ammunition (fifth) section.

    (2) Posts and movements prescribed hereinafter for thehowitzer squad apply with obvious modifications to an ammu-nition squad.

    d. Ammunition section.-The ammunition section consistsof the chief of section, the ammunition squad, and the driversof the ammunition trucks of the ammunition (fifth) section.

    * 5. FORMATION.--a. Order of formation.-A howitzer squadis formed as shown in figure 1. Higher-numbered cannon-eers, if present, form in order on the left of No. 7.

    b. To form.-(1) The place of formation is indicated andthe command given thus, for example: 1. IN FRONT (REAR)OF YOUR PIECES, or 1. ON THE ROAD FACING THE PARK, 2. FA.LLIN. Each gunner repeats the command FALL IN and hastensto place himself, faced in the proper direction, at the pointwhere the right of his squad is to rest. The cannoneersmove at the double time and assemble at attention in theirproper places. For the first formation of the howitzer

    2

  • 105-MM HOWITZER M2 5-8

    squads for any drill or exercise, the caution, "As howitzersquads," precedes the command. The chief of section, ifpresent, supervises the formation.

    (2) In case the front or rear of the carriages is desig-nated, each squad falls in at its post (par. 6).

    c. To call off.-(1) The command is: CALL OFF. The can-noneer on the left of the gunner calls off "One"; the can-noneer on the left of No. 1, "Two"; and so on.

    (2) After having called off, if a subsequent formationis ordered, the cannoneers fall in at once in their properorder.

    CS

    2 paces

    7|6 5 4 3 2 1 GFIGURE 1.-Formation of howitzer squad.

    SECTION III

    POSTS: MOUNTING AND DISMOUNTING

    1 6. POSTS OF HOWITZER SQUADS.--a. Carriages coupled.-(1) In front of piece.-The squad is in line facing to thefront, its center 2 paces from the front of the truck.

    (2) In rear of piece.-The squad is in line facing to thefront, its center 2 paces from the muzzle of the piece.

    b. Carriages uncoupled.--In rear of piece.-The squad isin line facing to the front, its center 2 paces from the endof the trail.

    B 7. To POST HOWITZER SQUADS.-The squads having beenmarched to the vicinity of the carriages are posted at thecommand SQUADS IN FRONT (REAR) OF YOUR PIECES. Eachgunner marches his squad to its carriage and posts it inthe position indicated.

    * 8. POSTS OF CANNONEERS.---a. Carriages coupled.-The can-noneers of the howitzer squad are posted as shown in figure 2.All are 2 feet outside the wheels and facing to the front.

    3

  • 8-10 FIELD ARTILLERY

    Higher-numbered cannoneers, if present, are posted as pre-scribed by the chief of section.

    b. Carriages uncoupled.-See paragraph 17 and figure 5.

    * 9. To POST CANNONEERS.--C. The command is: 1. CA1r-NONEERS, 2. POSTS. Each gunner repeats the command PosIs.The cannoneers move at the double time to their posts.

    b. For preliminary instruction, the squads on entering thepark are first posted with their carriages, and cannoneers arethen sent to their posts by the foregoing command. Thecommand is general, however, and is applicable when the can-noneers are in or out of ranks, at a halt or marching, andwhen the carriages are coupled or uncoupled.

    * 10. To MOUNT. -a. The command is: 1. CANNONEERS,