Summerlin earned much of his early fortune by hard work, personally
driving cattle throughout Florida and raising cattle along the
Peace River and
Kissimmee River, night and day. Wild cattle brought to North America by the
Spanish conquistadors roamed free across these vast stretches of land. Entrepreneurs could capture, breed, drive, and sell these cows for twelve to sixteen dollars each. Summerlin and his business partners developed a lucrative trade with
Havana and with the US naval base at Key West. Summerlin opposed
secession, indicating that he did not want to be part of a civil war. However, after the breakout of the American Civil War, he was quoted in official documents as saying that he never killed any person. He fed soldiers in the war, as was ordered, of both
Confederate and
Union armies. He and his partners provided beef and medicine to troops of both armies. Separately and privately, he still sailed past the Union blockade, mostly at night, to continue cattle sales to Cuba as usual. As a result of the war, Confederate money was worthless. However, with hard work and Union money that he earned, Summerlin bought the 160-acre (0.65 km²) Blount homestead, much of which would later be given to Polk County. (Ft. Blount was the earlier name of Bartow, the present county seat.) After the war, he continued selling cattle to the Union soldiers at
Fort Myers. Summerlin amassed a fortune of 15,000 to 20,000 head of cattle during this period, and was considered one of the wealthiest Floridians before he reached age 40. In this pre-banking era, he kept his gold and silver at his cabin in trunks, meal sacks, tin meat cans, woolen socks, or cigar boxes; behind door frames; in the rafters; or tossed in a corner. He used his wealth to purchase large tracts of land sprawling from
Fort Meade to Fort Myers. He bought a wharf at
Punta Rassa and a thousand acres (4 km²) nearby for cow pens, some of which he rented to other cattlemen. ==Donations in Bartow and Orlando==