Complete the following sentence: During the Russo-Japanese War, "Chōkai" assisted in the Siege of Port Arthur. During the third attempt to sink old freighters in an attempt to block the entrance to Port Arthur harbor, "Chōkai" was present as one of the escorts. During the third attempt to sink old freighters in an attempt to block the entrance to Port Arthur harbor, "Chōkai" was present as one of the escorts. <unk> <unk> <unk> <unk> <unk> <unk> <unk> <unk> <unk> <unk> <unk> <unk> ąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąą
Invasion of Sakhalin towards the end of the war.