US, 1st Volunteer Cavalry
Roosevelt resigned as assistant Secretary to the Navy and Volunteered to be one of the officers leading the Cavalry to fight in Cuba. The 1st Volunteer Cavalry eventually became known as the Rough Riders. His personal bravery and leadership was instrumental in the success of the operation. The Rough Riders suffered heavy casualties to both the fighting and disease, losing nearly 1/3 of the 1000 soldiers.

TR had many quotes:
His famous ‘speak softly and carry a big stick; you will go far’
Or, ‘the man who really counts in this world is the doer, not the mere critic, the man who actually does the work, even if roughly and imperfectly, not the man who only talks, or writes about how it ought to be done’