Under the rule of Mehmet II, the Ottomans conquered Constantinople in 1453, renaming the city Istanbul and making it the permanent capital of the Ottoman Empire. The Ottomans developed one of the most advanced fighting forces in the world through the use of small cannons, muskets, fast Arabian horses, and tactics like pretended retreats. They established a stable government through a simple taxation system on working classes and the use of qualified officials regardless of background.