When is Joey in the war horse resilient (In the book)

Joey must be resilient through the whole narrative. As Joey trains for war, he recognizes his purpose as a horse has changed from farming to fighting. Joey courageously works with Captain Nicholls to defeat the Germans, braving enemy gunfire and artillery to charge the enemy lines. When Joey is impressed by the Germans to serve first as a medical horse, and then later as an artillery horse, Joey bravely works even at risk to his own life. Joey recognizes that he must do as he is told or he will lose his life and will never be able to see Albert again. Indeed, through the course of the war, Joey thinks on his peaceful life in Devon, and longs to go home. The recognition of home is a sign of intelligence.