Approaches

Series of trenches, conventionally three in number, whose general direction is toward the salient of the fortification to be attacked. They zigzag acro the capitals, gaining ground to the front, and are connected at convenient intervals by other trenches parallel to the front of attack. They serve as means of approach to positions so near the work that a succe ful a ault may be delivered by the besiegers, or that breaching batteries for its reduction may be established. Approbation. See APPROVAL.