Invited by a disgruntled prince wanting to depose his father, an Islamic Sultan sieged a major Hindu city. He sailed south three days and entered the harbor of Sandabur-Goa with his army of armored cavalry and infantry. Catapults of massive stone were flung out from the harbor, but the sultan’s army made it ashore. Those who were not slaughtered fled into the king’s palace, which the sultan set on fire, forcing a surrender. Fighting over the city would persist for approximately two more years between this Islamic Bahmani Sultanate and the Hindu Kadambas Dynasty, but ultimately would fall to the Sultan for 15 years before returning to Hindu rule.
The naval battle off Tauris Island in the Adriatic Sea was fought between Caesarean and Pompeiian forces after the Great Roman Civil War. The opposing fleets clashed at such close quarters that melee combat essentially decided the battle.
Conquering a land is not as simple as just moving in and beating people up. Even after battles are won, the local people must accept your rule. If not, you will have to deal with uprisings like Julius Caesar did as he undertook his effort to conquer Gaul.