John: This site might be of interest to you - I've copied a small portion of the contents:

http://www.isle-of-man.com/manxnotebook/iomnhas/lm1p141.htm

"During the period of the long war with France, at the end of the last and the beginning of the present century, several volunteers corps were embodied. They were — " The troop of Constitutional Dragoons," "The Yeomanry Cavalry," "The Manx Gentlemen and Yeomanry," and " The South Manx Volunteers," and " Dawson’s Volunteers," who were foot soldiers. The troop of Constitutional Dragoons was raised in 1793, mainly by the exertions of George Quayle, of Castletown, but it did not last long, as in 1796 the Duke of Athol found fault with its appearance and with some arrangements made by the officers, who in consequence resigned, and the troop was disbanded. In 1799 the indefatigable George Quayle organised "The Manx Gentlemen and Yeomanry," which was disembodied on the conclusion of peace in 1802. Their uniform was dark blue. "The Manx Yeomanry Cavalry" was destined to have a longer career. It was formed in 1796, disembodied in 1802, but ....."