great array of spears and chariots
輵 centers on a grand military display: a great array of spears and chariots, evoking an imposing formation of ancient weaponry.
輵 combines 車 (chariot) with 曷, which likely contributes a phonetic element. The character is rare and its exact historical development is uncertain.
The left side 車 is a chariot, and the right side 曷 looks like a formation of spears and banners. Picture a great array of chariots and spears lined up for battle.
For カツ, imagine a commander shouting 'Cut!' to halt the great array of chariots: cut -> カツ, and the formation stops.