Gwanggaeto Attacks Baekje
Leading a fleet himself, Gwanggaeto took 58 fortresses and 700 villages and forced King Asin of Baekje to submit.

Tokyo National Museum · Public domain · Source
In 392, the year after his accession, Gwanggaeto took Baekje’s stronghold of Gwanmi. In 396 (Yeongnak 6) he led a fleet himself, crossed the Han and closed on the Baekje capital.
According to his stele, King Asin handed over a thousand captives and a thousand bolts of fine cloth and swore to be his "slave-retainer for ever", and the king’s brother and ten ministers were taken as hostages. Goguryeo now reached the north bank of the Han. Baekje turned to Wa for support, which led to Goguryeo’s rescue of Silla in 400.