We look at several explanations regarding what sin the soldier's committed related to their eating of the animals and how each explanation understands what Shaul did to rectify the situation.

The soldier's ravenously break their fast and commit a sin, Shaul obtains a large stone and rectifies the situation.

Yonasan eats unaware of the prohibition and then questions Shaul's decision when informed of it

Shaul joins the battle and prohibits the Jews from eating the rest of the day.

The Pelishtim panic causes Shaul to consider consulting the Urim Vetumim before deciding against it

The Gemara in Chullin discusses the omen of Yonasan and the Meforshim explain why it wasn't prohibited.

Yonasan devises an omen to determine whether to attack the Pelishtim.

Yonasan inspires his arms bearer to accompany him and cross to the Pelishtim mountain despite the danger

Yonasan proposes to his arms bearer to cross the mountain pass without informing his father

Further details of the battlefield and Klal Yisroel's lack of weapons