On 1 August 1829, a liberal force under the command of Count of Vila Flor, disembarked at the mouth of the ravines east of Ponta da Ajuda, which were unguarded, on the northern coast of São Miguel (near the parish of Achadinha).[2] Miguelist forces upon sighting the flotilla, marched forces from Ribeira Grande and a contingent from Furnas.[2]
Liberal forces encamped in the hills above Maia, near Ribeira dos Moinhos on the first night.[3] In the morning, they continued their march, crossing Maia, where the inhabitants had abandoned their homes.[3] They encountered few obstacles and advanced to Porto Formoso, whose fort and other defenses were also abandoned.[3]
Two days later a battle was fought at Ladeira da Velha near Porto Formoso, between the invading Liberal army and troops loyal to King Miguel.
The battle ended in a victory for the Liberals, which enabled them to firmly establish their control over the entire archipelago of the Azores. They used the islands as a base to invade the Portuguese mainland the next year, landing at Mindelo on 8 July 1832.