1. “Progressive fire” (_tir progressif_).[316] In this fire, after establishing a bracket (as a rule, one of 200 m.), every piece fires two rounds at each of four ranges, viz., at a range 100 m. less than the short limit of the bracket, at both ranges of the bracket, and at a range 100 m. greater than the long limit of the bracket. For example, if a bracket has been established for the target at 3000 and 3200 m., the battery would fire at 2900, 3000, 3200, and 3300 m. [316] Called “Zone Fire” in our field artillery. _Translator_. 2. “Sweeping” (_fauchage_) is employed when it is desired to cover a broader zone. In this every gun fires three rounds at each of the ranges designated. The first round is fired with the line of sight directed on the right portion of the target (or on the aiming point). Before firing each of the succeeding rounds, the direction of the piece is changed to the left by three turns of the traversing handwheel. At the next range this process is reversed, the direction of the piece being changed to the right by three turns of the traversing handwheel after each round. At 2500 m., for example, a battery can cover, in this manner, a space twice the width of its own front. 3. “Fire at successive ranges” (searching fire). In this fire salvos or volleys are delivered at the target at a number of ranges to be designated by the battery commander.[317] [317] The Belgian Drill Regulations (1907) give the following details in regard to the fire effect of a French four gun battery: In “progressive fire” (_tir progressif_), 32 rounds cover a space 100 m. wide and 400 m. deep (1 fragment covers 6 sq. m.). When direct laying is employed, one fragment covers 2 sq. m. In “progressive fire with sweeping” (_tir progressif avec fauchage_), 48 shrapnel cover a space 200 m. wide and 400 m. deep, each fragment covering 8 sq. m. Depending upon the range, 1¹⁄₂ to 5 minutes are required to secure adjustment. (See p. 119 supra).