itä-villinki is located just east of the larger villinki island. the island was a summer house district and the land had to be expropriated from the owners. resistance by the land owners delayed the process, and was still not fully complete by late 1916. fortification works for an 11-inch battery began in april 1915, but the battery was changed to 10 inch guns in autumn of the same year. 10 inch battery is built on a rock hilltop at the centre of the island. in july 1915 construction of a smaller battery for 75 mm guns (originally planned for 57 mm guns) on the eastern tip of the island began.