Who died in the movie War Horse?

This is done as follows:

1, the first British officer to buy Joey, died in the charge.

The young soldier and his younger brother, who raised horses in the German army, were arrested as deserters, and both of them were shot later.

3. Joey's good friend, the dark horse "Prince" (named by German grandfather), was exhausted when he dragged the cannon up the mountain.

4. The brother of the protagonist Albert was killed by poison gas on the battlefield.

Grandpa's granddaughter died of illness.