the main line of defence was the outer seaward defence of krepost sveaborg. the main line of defence had the newest fortifications and the heaviest and most modern armament. at the end of the war, it comprised (from west to east): miessaari and pyöräsaari, rysäkari, katajaluoto, harmaja, kuivasaari, isosaari, santahamina and itä-villinki islands and skatanniemi cape. the living conditions on the small, exposed islands were often poor, and the food supply was arranged from the older parts of the fortification with a week's supply of canned food, sugar and other compact food products stored on the islands. construction of bakeries on the outer forts began after the february revolution as a result of the demand of an artillery regiment committee formed by the soldiers.