Joshua 11:7

So Joshua came With the suddenness and rapidity which characterized all his movements, he did not wait for the northern confederacy to attack him at Gilgal, but marched against them with the intention of coming upon them before their army could be got into order.

against them suddenly He fellupon them, like a thunderbolt, so the word is to be literally understood as in the corresponding passage in Job 1:15, "the Sabeans fellupon them, and took them away." Without a word of warning he burst upon them in the mountain slopes of the plain, before they had time to rally on the level ground.