The Portuguese strengthened their position throughout the 1620s, building forts at Kalutara, Trincomalee, Batticaloa, and in Sabaragamuwa, and upgrading fortifications in Colombo, Galle, and Manikkadawara. A disastrous defeat at the battle of Randeniwela on 2 August 1630 in which Portuguese captain-general Constantino de Sá de Noronha was killed resulted in large parts of Portuguese Ceilao being overrun by the Kandyans. Internal instability yet again prevented the Kandyans from securing their acquisitions, and by the time of Senarat's death in 1635 lowland Sri Lanka was once again under Portuguese control.