In 1866, post Civil War, M&M added routes to Providence, Rhode Island, Norfolk and Savannah, Georgia.

In 1907 the Winsor Line of Philadelphia's J. S. Winslow & Company of Portland, Maine was purchased, with seven steamships.

The Winsor Line sailing ship Addie M. Lawrence took ammunition to Europe during World War I.

[1] Captain Jacob S. Winslow (1827–1902) founded the sailing ship company Winsor Line in 1861, he was born in Pembroke, Maine.

He had two shipyards that built over 100 ships, one in Portland, the Winslow Shipbuilding Company and one in Pembroke, Yarmouth County, Nova Scotia, Canada.