Built in 1914 to make P14 Enfield rifles for the UK, the factory was the nation's largest during WWI. After the US entered the war, it produced a modified version of the firearm designated the Model 1917. This became the most common rifle issued to US soldiers, and more than half were made here. Employing 15,000 workers, 20% of them women, the plant fabricated over a million rifles, accounting for 47% of total US wartime production.