The second incident occurred east of the fort as a Sauk raiding party, estimated by eyewitnesses to be as large as 100 warriors, attacked two militiamen who were investigating noises heard the night before.

The attacks also lent credence to the belief that more Ho-Chunk were set to join Black Hawk's war against white settlers in Illinois and Michigan Territory.

However, Sauk Chief Black Hawk and others disputed the treaty, claiming that the full tribal councils had not been consulted, nor did those representing the tribes have authorization to cede lands.

[1] Angered by the loss of his birthplace, Black Hawk led a number of incursions across the Mississippi River beginning in 1830, but each time was persuaded, without bloodshed, to return west.

[2][3] As construction of the fort commenced Black Hawk found no allies so he attempted to return to Iowa, but events overtook him and led to the Battle of Stillman's Run.

[2] One week after the clash at Stillman's Run, on May 21, 1832, the Indian Creek massacre occurred well south of Fort Blue Mounds, near present-day Ottawa, Illinois.

[6][7] According to one witness statement, directly preceding the first attack at Fort Blue Mounds on June 6, there was an argument between William Aubrey's wife and a Ho-Chunk man.

[2] At the fort, the settlers correctly guessed that the attackers were Ho-Chunk and not the warriors of Black Hawk's "British Band," which was 40 miles (64 km) away at Lake Kegonsa.

[10] Following his death, mounted troops and riders from the fort traced the band responsible for the attack to a recently abandoned camp, and then to the Wisconsin River, where the search ended.

Their purpose was to conduct reconnaissance operations but they ended up finding the body of Lieutenant Force beneath a tree about two miles (3 km) east of the fort.

Until the end of the war, Fort Blue Mounds served primarily as a supply center for the militia as they continued their pursuit of Black Hawk across Wisconsin.