Final answer:
The theme of the excerpt is that people's actions determine their legacy.
Step-by-step explanation:
The theme of the excerpt is that people's actions determine their legacy. The lines 'If we help each other and fight side by side, we will make a lasting name for ourselves, we will stamp our fame on men's minds forever' emphasize the importance of noble actions and fighting for a greater cause. The theme is further reinforced when the excerpt mentions forgetting about death and inspiring joy in battle, suggesting that the characters are more focused on leaving a lasting impact than on their own mortality.