The town of Brussels was first settled in 1856 by four families from Brabant, Belgium. They were Ferdinand Delveaux and family, Etienne Dandois, his son-in-law, Alexis Franc and Francois Patris. They were part of a large group of emigrants that came from Belgium in 1856-57. Forty-five families settled in what is now the town of Brussels, claiming 3120 acres of land in the western part of the town. Many came to settle in what is the town of Union, and around 15,000 Belgians settled in Brown County and Kewaunee County starting in 1854.
More history of can be found at the Peninsula Belgian American Club website.
On October 8, 1871, suddenly, in the blackness of the night, a vast torrent of fire descended upon the area. The great fire swept the entire Belgian settlement, being about ten miles wide and sixty miles long. The greatest destruction was in the town of Brussels, where about one hundred people perished. At Williamsonville, a small sawmill village of seventy people, sixty were burned to death in the middle of a three-acre field. The area is now known as the Tornado Memorial Park.
In the 1880's the Belgians, with plentiful harvests, revived the great Belgian festival, the kermiss. The Brussels kermiss is held on the first Sunday of September, and other Belgian communities follow.
More Township information can be found on Wikipedia.