During world war i, the second phase in battles across enemy lines and no-man’s-land was heavy bombardment sniper fire aerial bombing infantry attack

They were the names of infantry attacks

No Man's Land is the term used by soldiers to describe the ground between the two opposing trenches. Its width along the Western Front could vary a great deal. The average distance in most sectors was about 250 yards (230 metres). It was actually an area controlled by the enemy and a secret mission with a name behind enemy lines was launched.

The answer is Infantry attacks

Explanation:

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where is the picture?