The southern half of Florida played a unique and significant, if often underrated, role in the Civil War. The Federal occupation of the Charlotte Harbor-Caloosahatchee River area in late 1863 and early 1864, though a small-scale operation compared to military activities elsewhere in the country, proved to be one of the most important campaigns in the region. Taking place between the Union stronghold in the Keys and Confederate possessions at Tampa and points north, this campaign highlighted many elements characteristic of the struggle in south Florida. Despite the isolation of the area, and the small number of men involved, it had a marked impact on the course of the war throughout the state.
Dillon, Jr., Rodney E.
""The Little Affair": The Southwest Florida Campaign, 1863-1864,"
Florida Historical Quarterly: Vol. 62:
3, Article 5.
Available at: https://stars.library.ucf.edu/fhq/vol62/iss3/5