The word taḍram evokes fire, although the verse does not literally say “war is like a fire.” It is better read as a metaphorical image. The language of awakening in tabʿathūhā is followed by the imagery of a blaze.
Together they establish a distinction: the decision to start fighting is deliberate, but the ensuing escalation may outrun the initial decision. That prepares the reader for the mill and multiplying-offspring images in the next verses.