Upon entry to World War I the US government took the Hamburg-American Line piers in Hoboken under eminent domain, and which became the major point of embarkation for more than three million soldiers, known as "doughboys". In 1916, an act of sabotage literally and figuratively shook the region when German agents set off bombs at the munitions depot in New York Bay at Black Tom. The fore-runner of Port Authority of New York and New Jersey was established on April 30, 1921. Huge transportation projects opened between the wars: The Holland Tunnel in 1927, The Bayonne Bridge in 1931, and The Lincoln Tunnel in 1937, allowing vehicular travel between New Jersey and New York City to bypass the waterfront. Hackensack River crossings, notably the Pulaski Skyway, were also built. 125th Street Hudson River bridge never got beyond planning stages.