The Rashidun Caliphate is characterized by a twenty-five-year period of rapid military expansion, followed by a five-year period of internal strife. The Rashidun Army at its peak numbered more than 100,000 men. By the 650s, the caliphate in addition to the Arabian Peninsula had subjugated the Levant, to the Transcaucasus in the north; North Africa from Egypt to present-day Tunisia in the west; and the Iranian plateau to parts of Central Asia and South Asia in the east.