Union Lieutenant General Ulysses S Grant became the 18th President of the United States on March 4th 1869, the first of many Civil War veterans to hold that office. His first inauguration was performed by Supreme Court Chief Justice Salmon P Chase on the East Portico of the White House. President Andrew Johnson refused to attend the inaugural ceremonies it is believed because President elect Grant had refused to sit with him in his carriage on the ride to his inauguration. Grant’s inaugural parade included eight divisions of Army, and his inaugural ball was held that night in the Treasury Building.
If you’re interested in reading
Ulysses S. Grant's First Inaugural Address this is a good place to start.