Church of the Ascension which became house summer church of grand dukes intended only for members of a most august family (because her internal sizes are rather small) and connected the covered transition to the palace. She had and important defensive value – a watchtower with which patrol accepted "cable" fiery signals of danger from Moscow area. By means of torches or the lit birch bark they were transferred further – to Simonov Monastery and to Ivan the Great Bell Tower. From the South then the greatest danger threatened boundaries of Moscow – the Tatar attacks.