The historic Rideau Canal descend, part of which shown, is a series of locks built as a preventive military measure during period 1826-1832 after the War of 1812 between Canada and USA extends all the way down to the Ottawa River at the top left of my picture.
Fearing future American invasions Britain built a series of canals as well as a number of forts in eastern Canada including the Rideau all along the Ottawa River designed to deter and impede any US incursions.
Fortunately, there never was another war between Canada and the USA and it was never used as a military supply route however, it was a success quickly becoming a busy commercial artery from Montreal to the Great Lakes until 1849 when a series of new locks were built bypassing the Saint Lawrence River rapids providing merchants a quicker, cheaper, alternative route.
Lieutenant-Colonel John By of the Royal Engineers oversaw construction of the Rideau Canal while private contractors built it employing thousands of French and Irish Canadian workers.
Some of the private contractors included famous names like John Redpath, Thomas McKay, Robert Drummond, Thomas Phillips, and Andrew White, who probably contributed to its unexpected cost overruns before its completion meanwhile, increasing their fortunes.
The cost overruns forced the retiring Colonel By from the British military and his receiving scant recognition for the awesome work accomplished.
This is my contribution for WP single word prompt:”DESCEND”.