This is from Mapleshade's vengeance, the part when she loses her kits. The kit on the branch is larkkit and the kit in the middle is petalkit the one farthest away is little patchkit. Mapleshade is on the right, trying to save her kits. Sadly all three kits end up drowning even when the riverclan cat went and tried to save them, they just ended up bringing the bodies of the kits back. :(