During the Civil War, Smith and Wesson sold thousands of little single-action revolvers to soldiers. These were little .22 short and .32 rimfire revolvers that enlisted men bought with their own money to stick in their pockets or waistbands before marching off to battle.
The tactics of the day had soldiers line up on each side and fire their Springfields at eachother then affix bayonets and charge. The smart ones who bought these little S&Ws saw the charging Reb\'s or Yanks and drew their little mouseguns and emptied them into the oncoming enemy before joining the melee.
That\'s the way that I would plan to use a mousegun. They might not knock the enemy down but they will soften the enemy before the main event.