With the Russian Far East fleet trapped at Port Arthur, the only other Russian Fleet was the Baltic Fleet; it was half a world away, but the decision was made to send the fleet on a nine-month voyage to the East. The United Kingdom would not allow the Russian navy to use the Suez Canal, due to its alliance with the Empire of Japan, and due to the Dogger Bank incident where the Baltic Fleet mistakenly fired on British fishing boats in the North Sea. The Baltic Fleet traversed the world to lift the blockade on Port Arthur, but after many misadventures on the way, was nearly annihilated by the Japanese in the Battle of the Tsushima Strait. On land the Imperial Russian Army experienced logistical problems. While commands and supplies came from St. Petersburg, combat took place in east Asian ports with only the Trans-Siberian Railway for transport of supplies as well as troops both ways. The rail line between St. Petersburg and Port Arthur was single-track, with no track around Lake Baikal, allowing only gradual build-up of the forces on the front. Besieged Port Arthur fell to the Japanese, after nine months of resistance.