to enter the Ethiopian highlands, where they began to sack and burn numerous churches, including Atronsa Maryam, where the remains of several Emperors had been interred. Dawit II died in 1540 and his son Menas and the future emperor was captured by the forces of Imam Ahmad; the Empress was unable to react as she was besieged in the capital. In 1543, a smaller number of Abyssinians soundly defeated the larger Adal-Ottoman army with the help of the Portuguese navy, which brought 400 musketeers led by Cristóvão da Gama via Massawa, a port in the Eritrean Kingdom of Medri Bahri, an important port today in present-day Eritrea. However, Da Gama was captured in the battle of Battle of Wofla and later killed. The 500 musketeers were led by Bahri Negassi Yeshaq, king of Medri Bahri. Yeshaq not only provided the Portuguese with provisions and places to camp in his realm but also information about the land. The Bahr negus also joined Emperor Gelawdewos and the Portuguese in the decisive Battle of Wayna Daga, where tradition states that Ahmad was shot in the chest by a Portuguese musketeer, named João de Castilho, who had charged alone into the Muslim lines and died. The wounded Imam was then beheaded by an Ethiopian cavalry commander, named Azmach Calite. Once the Imam's soldiers learned of his death, they fled the battlefield. The death of Imam Ahmed and the victory in the Battle of Wayna Daga caused a collapse of Ahmed forces and forced a Adalite retreat from Ethiopia. Emir Nur ibn Mujahid succeeded his uncle Ahmad ibn Ibrahim al-Ghazi as leader of the Adal forces and consolidated his power by marrying Bati del Wambara. In 1559, Emir Nur's cavalry defeated and killed Emperor Gelawdewos in battle, and sacked the Abyssinian town of Waj. Simultaneously, Abyssinian General Ras Hamalmal sacked the Adalite capital Harar, captured Sultan Barakat ibn Umar Din and executed him, thus ending the Walashma Dynasty. J. Spencer Trimingham postulates that the captured Barakat ibn Umar Din was in fact returned to Adal in exchange for Prince Menas in negotiations led by Bati del Wambara. Emir Nur ibn Mujahid, returning from his campaign, would display the head of Emperor Gelawdewos in Harar as a show of triumph. In 1577, Emperor Sarsa Dengel defeated, captured and executed Sultan Muhammad V in Bale. He was succeeded by Imam Muhammad Jasa, a relative of Ahmad ibn