(1) General. The Infantry Battalion Gun, Model 92, is a 70-mm. rifled gun capable of delivering fire from a range of 200 to 2,800 yards. Its characteristics are–
Weight:
Gun _ _ _ _ _ 101 lbs.
Mount _ _ _ _ _ 77 lbs.
Mounted gun and caisson _ _ _ _ _ 420 lbs.
Length of bore _ _ _ _ _ 50 in. (approx.)
Over-all length _ _ _ _ _ 27 in.
Mounted over-all length _ _ _ _ _ 5 ft. (approx.)
Width of wheel tread _ _ _ _ _ 27 in. (approx.)
Effective range _ _ _ _ _ 300 to 1,500 yds.
Traverse _ _ _ _ _ 45°
Elevation _ _ _ _ _ -10° to +50°
Danger area of burst _ _ _ _ _ 40 yds. (approx.)
(2) Breechblock. Two threaded segments rotating and opening downward.
(3) Carriage
(a) Recoil Mechanism. Length of recoil, about 4 inches.
(b) Traversing and Elevating Mechanism. Traversing hand-wheel on the left of the barrel and elevating handwheel on the right. Both handwheels are operated by the gunner, who lays first for direction, then for elevation. Elevating mechanism is similar to that of our old pack howitzer. Traverse is about a heavy pintle mounted on the axle.
(c) Shield. Armor plate about one-eighth of an inch thick.
(d) Trail. Split 5 feet long, welded except where riveted to spade.
(e) Panoramic Sight (same as field artillery). Mounted on the sight bracket on the left side of the piece. The sight bracket includes a range drum with four divisions marked in mils, an elevating bubble, and a cross bubble for correcting for difference in level of wheels.
(4) Ammunition. Semifixed with brass case. High explosive shrapnel and smoke shells are used. The range is extended by increasing the powder charge. At maximum range the time of flight for the different powder charges is–
Charge No. 1 _ _ _ _ _ 50 sec. (3,075 yds.)
Charge No. 2 _ _ _ _ _ 25 sec. (1,975 yds.)
Charge No. 3 _ _ _ _ _ 20 sec. (1,300 yds.)
Charge No. 4 _ _ _ _ _ 15 sec. (985 yds.)
Minimum permissible ranges with instantaneous fuzes employing low-angle fire varies with the powder charge, elevation of gun, and target. With ground level ranges are–
Charge No. 1 _ _ _ _ _ 1,100 yds.
Charge No. 2 _ _ _ _ _ 660 yds.
Charge No. 3 _ _ _ _ _ 225 yds.
Charge No. 4 _ _ _ _ _ 110 yds.
Minimum ranges with delayed-action fuzes ground level are–
Charge No. 1 _ _ _ _ _ 660 yds.
Charge No. 2 _ _ _ _ _ 330 yds.
Charge No. 3 _ _ _ _ _ 330 yds.
Charge No. 4 _ _ _ _ _ 330 yds.
Rate of fire: 10 rounds per minute, 5 rounds per box.
(5) Other Vehicles
(a) Limber. This is a simple box mounted on an axle. Two boxes of ammunition, sights, and accessories are carried in the limber chest.
(b) Caisson. Similar in construction to the limber and contains three boxes of ammunition.
- SUPPLY
Figures 8 to 12 inclusive are included simply to show some methods used by small units in supplying ammunition, food, and water to the front lines. Of particular interest is the method employed by the Japanese soldier in transporting ammunition (figure 9). It will be noted that the ammunition boxes are carried as shoulder packs, leaving the arms free for negotiating difficult terrain and permitting greater freedom of action under fire. Figure 10 shows the preparation of simple food, and figure 11 shows a method of getting it forward over exposed terrain. This method is of interest, for it indicates that advance elements, even though they may be held to the ground by hostile fire, can still be fed by a simple process. What holds true for the supply of ammunition to small units also holds true for the supply of water, as large canteens strapped on the back of the soldier will be noted in figure 12.
- THE FIFTH COLUMN
a. According to a prisoner taken in northwestern Malaya, the Japanese landed without rations and got help from Fifth Columnists.
b. The Japanese are making wide use of propaganda leaflets dropped from the air.
c. Civilians dressed in the uniforms of British-Indian soldiers have operated with the Japanese. In some instances they oven know the British-Indian N.C.O.'s by name.
- REPORT OF FOREIGN CORRESPONDENT
The following excerpts from an account by a war correspondent with the British Forces in Northern Malaya showing Japanese methods of warfare are included in this bulletin for informational purposes. The account has not been confirmed, but the reader can in some instances draw his own conclusions from the confirmed data contained in Sections 1 to 7 inclusive of this bulletin.
. . . . . . . . . . . . . . .
"Japanese successes have been attained through superiority of numbers and equipment and the use of clever but simple tactics especially adapted to the tropical lands. British officers at the front describe Japanese losses as ‘enormous’, but emphasize that the attackers keep pouring in, apparently determined to advance at any cost…
"The Japanese equipment includes one innovation, a two-man carrier, probably especially designed for use in the tropics. This little carrier can negotiate smaller streams, rice fields, rubber groves, and thin jungles, but is not heavily enough armored to resist British antitank rifles. It is proving a useful weapon in combination with the heavier tanks and armored cars that the Japanese possess.
"The Japanese tactics are based on infiltration and mobility. Apparently groups of men are simply being told to reach a certain objective many miles ahead, and they scatter all over the map to do it. When groups encounter a British strong point, they do not attack, but melt away and filter past along the flanks of the British position, concealing their movements in jungles of rubber trees. The strong point is later attacked by strong Japanese forces armed with heavy equipment, and simultaneously the Japanese close in on the flanks and rear.
"Japanese advance patrols armed with tommy guns sometimes for days are constantly working toward an objective, often lying low in the dense undergrowth to conceal themselves from the British. A number of advance units are sent to attack the same objective, so that if some meet grief on the way, the others will slip through and gain the goal. The Japanese obviously have made an intimate study of their terrain and apparently know every road and path in Northern Malaya.
"The Japanese regulars have a unique uniform, consisting only of light khaki shorts, a sleeveless upper garment that looks like an undershirt, and low rubber shoes. The Japanese tactics are leading to a savage warfare of movement, ambush, surprise, and encirclement. An American military observer I met at the front said:
"‘It is like Indians fighting with tommy guns.’
"The Japanese have air superiority in Northern Malaya, but so far they have not been using planes much at the actual front in bombing or strafing. The raids on British airdromes are bringing air battles in which the British, despite numerical inferiority, emerge victorious.
"British land forces are rapidly adapting themselves to the Japanese type of jungle fighting, and much of the struggle at the front now consists of patrols stalking patrols, infiltration and counter-infiltration, intermingled with hard battles for strong points in which artillery is brought into use…
“British officers have been in the thick of close-in fighting, and I heard many stories of officers leading Indian units in savage charges.” (By F. Tillman Durdin, New York Times, December 18, 1941)