|Source - Norwich University|
The Norwich University and their motto explained:
It was thought for generations..."that the words, 'I will try' were first uttered in 1847 by Colonel Truman B. Ransom in the heat of battle during the Mexican War."
The answer...to the...question, "who did coin the University motto, and when?" can be found in the first volume of Ellis' History of Norwich University (1912). [which stated that] the origins of the words "I will try" can be traced to the War of 1812.
They were uttered by Colonel James Miller of New Hampshire.