Well, I think what the OP's looking for is not only a good war strategist, but also a good leader of their people who was able to consolidate power and keep it, in other words, a true Machiavellian. In this regard, I would say hats off to a few leaders in particular:
Genghis Khan: nothing more to be said on that
Charlemagne: essentially founded the Holy Roman Empire, conquered most of Western Europe and defended it from Muslim incursion
Ieyasu Tokugawa: after the Warring States period, finished what Nobunaga started, united Japan under his banner and began the Edo period
Napoleon: volumes have already been said here on him
Simon Bolivar: Latin America's liberator, instigated and won revolutions in most of Central and South America
Julius Caesar and Alexander the Great would be on the list, aside from that whole assassination without a clear heir thing...
The American Civil War saw some brilliant generals in action: Grant, Lee, Sherman, and Jackson come to mind off the top of my head
Genghis Khan: nothing more to be said on that
Charlemagne: essentially founded the Holy Roman Empire, conquered most of Western Europe and defended it from Muslim incursion
Ieyasu Tokugawa: after the Warring States period, finished what Nobunaga started, united Japan under his banner and began the Edo period
Napoleon: volumes have already been said here on him
Simon Bolivar: Latin America's liberator, instigated and won revolutions in most of Central and South America
Julius Caesar and Alexander the Great would be on the list, aside from that whole assassination without a clear heir thing...
The American Civil War saw some brilliant generals in action: Grant, Lee, Sherman, and Jackson come to mind off the top of my head