I personally liked this book a lot because it has a compelling story which pulls you in from the start, fairly easy language which can be read by a small child without help, and most importantly, life lessons. It tells young children the importance of family, how to treat animals with love, and basic things like how to not disobey your parents. This story is told by a grandfather to his grandson, who had asked him to tell him about the "worsest thing" (as said by the child, also named Antonio like his grandfather) he had ever done. He tells the child about the time during the Spanish civil war, when he was a young child and used to help his own father to breed bulls for the bullring, not knowing that those bulls were fated to die.
And then he helps his father bring a bull into the world, quickly bonding with it, and naming it Paco. When he finds out about the horrors of the bullring, he quickly makes a plan to free Paco-, and with him, all the bulls. He ends up in the woods with Paco and his mule Chica. The war reaches his village, and his family dies in the bombing. He goes back to his village, but loses Paco when he goes back to him. He proceeds to travel with Chica, and is eventually founded by his uncle Juan, who manages to save him. Their procession reaches a countryside village, where he finds his sister Maria.
When the war was reaching that village too, his uncle Juan sends him to his mother. He spends the rest of his life there. The story ends on a heartwarming note, and it would surely make the reader smile. On the Whole, the book of great, and I expected no less from an author like Michael Morpurgo.