Original sentence: At around 1700, the Shogunal vanguard, made up largely of about 400 men of the Mimawarigumi under Sasaki Tadasaburo, approached a Satsuma-manned barrier post at the Koeda brige (小枝橋), Toba (located in what is now part of Minami-ku, Kyoto)
Edited sentence: At around 1700, the Shogunal vanguard, made up largely of about 400 men of the Mimawarigumi, armed with pikes and some firearms, under Sasaki Tadasaburo, approached a Satsuma-manned barrier post at the Koeda brige (小枝橋), Toba (located in what is now part of Minami-ku, Kyoto)