Sentence Examples with the word trench warfare

But in order to obtain an adequate field of view, the mirrors, and therefore the box, had to be made somewhat large, and in the close-quarters conditions of trench warfare even the few inches by which they projected over the parapet or ether cover made them sufficiently obvious to draw fire.

But trench warfare was the order of the day, and the British and French were trying to carry this on without that ample artillery support which is almost indispensable when earthworks have to be stormed under modern tactical conditions.

The use of reflecting mirrors for the purpose of observing from cover is no novelty, and during the trench warfare of the Crimean War 1854-5 a device was patented which scarcely differs from the simple mirror periscope of the World War.