who were the parties involved in the last war?
Military campaigns launched by the Caliph Abu Bakr Versus rebel Arabian tribes
Ridda wars
The Ridda Wars (), or Wars of Apostasy, were a series of military campaigns launched by the Caliph Abu Bakr against rebel Arabian tribes during 632 and 633, just after the death of the Islamic Prophet Muhammad. The rebels' position was that they had submitted to Muhammad as the prophet of Allah, but owed nothing to Abu Bakr. 

who took over the islamic empire after the caliphs UNANSWERABLE what is this succession issue? The succession to Muhammad is the central issue that split the Muslim community into several divisions in the first century of Islamic history. Shia Islam holds that Ali ibn Abi Talib was the appointed successor to the prophet Muhammad. Sunni Islam maintains Abu Bakr to be the first leader after Muhammad. who was this leader maintained by the sunnis? A father-in-law and companion of the Islamic prophet Muhammad. He was the first of the Rashidun Caliphs. where was he from? Mecca, Saudi Arabia. how did he die? He fell sick and did not recover. He developed a high fever and was confined to bed. His illness was prolonged did he take part in any war? Yes - he participated in the Battle of Uhud, Battle of the Trench, Invasion of Banu Qurayza, Battle of Khaybar, Ridda Wars
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Ridda wars [SEP] Introduction
The Ridda Wars (), or Wars of Apostasy, were a series of military campaigns launched by the Caliph Abu Bakr against rebel Arabian tribes during 632 and 633, just after the death of the Islamic Prophet Muhammad. The rebels' position was that they had submitted to Muhammad as the prophet of Allah, but owed nothing to Abu Bakr. Some rebels followed either Tulayha, Musaylima or Sajjah, all of whom claimed prophethood. Most of the tribes were defeated and reintegrated into the Caliphate. The peoples surrounding Mecca did not revolt. A detailed reconstruction of the events is complicated by the frequently contradictory and tendentious accounts found in primary sources.