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Stieler would probably have seen Mohammed as a military leader at the roots of Ottoman Empire. This position is not exactly within current scholarship, but the history of Islam was not a well researched topic in Stieler's times. The passage is from 1695. The Ottoman Empire peaked in 1683, controlling lands from Algiers to Baku, from Budapest to Mecca, being larger than any European state, even than the ancient Roman Empire. Writing this, he probably remembered that in 1685 they were invading Vienna which was 600 km from his home city of Erfurt.
This map was published in Germany circa 1670, as a reference that the geographical extent was clear at the time.
The Battle of Vienna of 1685 was when perception of Ottomans as an overwhelming military power began to change. But the turning point was the Battle of Zenta on 11 September 1697.