The Royal Welch Fusiliers was a regiment of the British Army, part of the Prince of Wales' Division. It was founded in 1689 to oppose James II and the imminent war with France. The regiment was numbered as the 23rd Regiment of Foot, though it was one of the first regiments to be granted the honour of a fusilier title and so was known as The Welsh Regiment of Fusiliers from 1702. The "Royal" accolade was earned fighting in the War of the Spanish Succession in 1713.
It is one of the oldest regiments in the regular army, hence the archaic spelling of the word Welch instead of Welsh.
The light infantry and grenadier companies of the Fusiliers saw bloody action at the Battle of Bunker Hill and the Battle of Guilford Court House in the American War of Independence. The regiment participated in nearly every campaign from Lexington & Concord to Yorktown.