John D. Champlin, Jr., The American Cyclopædia (1879)
“ Military pensions are divisible into two general classes, invalid and gratuitous. Invalid pensions are granted to persons who have become disabled in the military or naval service, in consequence of wounds or sickness, so as to be in whole or in part incapable of supporting themselves and those dependent on them. Gratuitous pensions are given as rewards for eminent services, and are usually granted at the close of a war or of a term of service. ”
