“Struggle” translates the Arabic verb jāhada , from which the word jihād comes, and here it appears in the form of a command. There are seven such commands in the Quran, and three of those come in Sūra 9 (also vv. 73, 86). The sense of struggle that the Quran intends in each imperative may be partly determined by context. If the context is a battle scene, and struggle appears close to commands to fight ( qātala , e.g., v. 36), struggle tends to pick up the sense of fighting.

See the analysis of these commands at 66.9.