What did Cross do the day after Ted Lavender got killed?

From the text:

On the morning after Ted Lavender died, First Lieutenant Jimmy Cross crouched at the bottom of his foxhole and burned Martha's letters. Then he burned the two photographs. There was a steady rain falling, which made it difficult, but he used heat tabs and Sterno to build a small fire, screening it with his body, holding the photographs over the tight blue flame with the tips of his fingers.