The Port of Liverpool had for many years been the United Kingdom's main link with North America, and would prove to be a key part in the British participation in the Battle of the Atlantic. As well as providing anchorage for naval ships from many nations, the port's quays and dockers would handle over 90 per cent of all the war material brought into Britain from abroad with some 75 million tons passing through its 11 miles (18 km) of quays. Liverpool was the eastern end of a Transatlantic chain of supplies from North America, without which Britain could not have pursued the war.