Battle of Port Gibson May 1. Battle of Champion Hill May 16. Big Black Bridge May 17. Siege of Vicksburg May 18-July 4. Assaults on Vicksburg May 19 and 22. Advance on Jackson, Mississippi, July 4–10. Near Clinton July 8. Near Jackson July 9. Siege of Jackson July 10–17. Moved to New Orleans, Louisiana, August 13. Duty at Carrollton, Brashear City, and Berwick until October. Western Louisiana "Teche" Campaign October 3-November 30. Ordered to Algiers December 13, then moved to Texas December 18. Duty at Matagorda Bay and Indianola until February 1864, and at Matagorda Island until April 19. Moved to New Orleans, then to Alexandria, Louisiana, April 19–27. Red River Campaign April 27-May 22. Actions at Alexandria April 29 and May 2 to 9. Graham's Plantation May 5. Retreat to Morganza May 13–20. Duty at Morganza until December. Expedition to the Atchafalaya May 30-June 6. Expedition to mouth of White River and St. Charles, Arkansas, September 13–20. Moved to Dauphin Island, Mobile Bay, December 7. Granger's Pascagoula Expedition December 14, 1864, to January 1, 1865. Duty at Pascagoula until January 31. Consolidated to a battalion of four companies January 22. Moved to Barrancas, Florida, January 31; then to Pensacola, Florida, March 14. Steele's march through Florida to Mobile March 20-April 1. Occupation of Pollard March 26. Siege of Spanish Fort and Fort Blakely April 1–9. Assault and capture of Fort Blakely April 9. March to Montgomery and Selma April 13–22. Return to Mobile May 3 and duty there until July. A tragedy of mass drownings involving the 69th Indiana occurred at Matagorda Bay, Texas, during preparations for the invasion of Texas. The regiment was ordered to assemble at Matagorda Island on the Gulf Coast of Texas in preparation for a march north to Tyler. To move from their inland camp at Indianola on Matagorda Bay to Matagorda Island, it was necessary to cross a 300-yard stretch of the bay using a ferry made up of pontoon boats tied together in a raft.