How had David been killed?

David and the veterinary horses pulling his wagon were killed by a stray shell. Albert was devastated by the loss of his friend.

Then one evening there was terrible news from the front, news that Albert’s friend, David, had been killed, along with the two horses that were hauling the veterinary wagon that day. ‘A stray shell, ’Albert told me as he brought in the straw for my stable. ‘That’s what they said it was – one stray shell out of nowhere and he’s gone. I shall miss him, Joey. We shall both miss him won’t we?’