Final answer:
At the beginning of the poem, the warrior's problem is not clear. However, the poem suggests that his inability to withdraw from battle leads to his downfall.
Step-by-step explanation:
At the beginning of the poem, there is no clear message about the warrior's problem. It is mentioned that the warrior is a son of a heroic race and loves military books and pictures. He carries a wooden sword and imagines himself in battle, assuming aggressive and defensive postures. However, he makes a military error by overextending his pursuit and finds himself at a shallow brook, unable to directly cross to continue his imaginary battle. Nevertheless, he finds a way across the brook and continues his pursuit. The poem implies that the warrior's lust for war and inability to withdraw from battle ultimately leads to his downfall.