 On May 3 the Shimazu-Arima army entrenched on a hill in front of Shimabara and received the attack of the Ryūzōji who were well armed with muskets, including high calibre ones.They attacked the hill in three columns, one advancing along the road, another advancing along the hills and a third along the beach.They were harassed by the Arima with large caliber arquebuses mounted on boats.