On July 5, 1898, the 2nd Wisconsin was transferred To the First Brigade, First Division, First Army Corps, and went on to serve in Puerto Rico. The unit arrived at first at Guanica, Puerto Rico but was immediately redirected to Ponce, with their transport entering the harbor on July 27.
The unit's assigned line of march was along the road leading from Ponce to San Juan, the capital. This route led past the small town of Coamo. Here, it was found that the Spanish had entrenched. On August 9, while other units were sent to attack on the flank, the 2nd Wisconsin, now only 824 men strong, was directed to advance on the main road into the rown. Before the unit could get into position, firing was heard on the flanks, indicating that the other units were already engaged. A battalion of the regiment was ordered forward quickly, only to find the bridge leading into the town burned. Another route had to be found. The 2nd Wisconsin finally entered the town, only to find it deserted. The town has already surrendered to reporter Richard Harding Davis!
On August 10, the 2nd Wisconsin continued to exchange fire with the Spanish troops.
On the night of August 12 at Aibonito, the 2nd and 3rd Wisconsin made a flanking in march to get behind the Spanish troops in preparation for an attack on August 13. Before the attack could occur, it was learned that the armistice was signed and the fighting was over. The expected attack was called off.
The unit was mustered out of service between November 9 and November
Total Strength of Regiment------------1349
Died of disease------------------------38
Clerk of Joint Committee on Printing, The Abridgement of Message from the President of the United States to the Two Houses of Congress. (Washington: Government Printing Office, 1899.Vol 3. p 242-243.
Dietz, J. Stanley, "The Battleflags and Wisconsin Troops in the Civil War and the War with Spain, " 1943.