Final answer:
Marty found that Shiloh was injured on the way back across the river, a crucial event in the novel 'Shiloh' that affects the storyline.
Step-by-step explanation:
Marty discovered that Shiloh was injured on the way back across the river. This is a key plot point in the novel 'Shiloh' by Phyllis Reynolds Naylor, which is a story about a young boy named Marty who finds a beagle in the hills near his home. Marty's discovery of Shiloh's injury is significant as it leads to a series of moral dilemmas and decisions he must face regarding the dog's welfare and his relationship with the dog's original owner.