May 14th, 1864 was the first day of the Battle of Resaca. This was the first large scale battle in the campaign. There were approximately 160,000 troops engaged over a two day period. Union casualties were around 3560 and Confederate casualties numbered around 2600.
General Hood attacks the Federal line north of Resaca and pushes them out of their lines and back about a mile. The 5th Indiana Battery shows up just in time and is able to support the retreating Federals, causing Hood to return to his lines and allowing the Union troops to retake their lines. There was fighting along the entire four mile long front.