Here's a somewhat different example of a traditional war that turned into a guerilla war (one that we eventually won). It doesn't seem to me to be as comparable a situation, since in the case of the Phillipines we were trying to colonize...but this one does have casualty figures. We had more than 4000 US KIAs b/c of the guerilla war -- but still won in the end.
http://www.historyguy.com/PhilipineAmericanwar.html DESCRIPTION OF CONFLICT:
As early 1899, U.S. and Filipino forces faced off as a tense situation became worse. American forces held the capitol of Manila, while Aguinaldo's army occupied a trench-line surrounding the city. On the evening of February 4, 1899, Private William Grayson of the Nebraska Volunteers fired the first shot in what would turn out to be a very bloody war. Grayson shot at a group of Filipinos approaching his position, provoking an armed response. Shooting soon spread up and down the ten-mile U.S.-Filipino lines, causing hundreds of casualties. Upon the outbreak of hostilities, U.S. troops, supported by shelling from Admiral Dewey's fleet, quickly overwhelmed the Filipino positions while inflicting thousands of casualties. Within days, American forces spread outward from Manila, using superior firepower, mobile artillery and command of the sea to full effect.
By November of 1899, Aguinaldo and his forces had been pushed further and further into central Luzon (the main Philippine island) and he realized he could not fight the Americans with conventional military units. At this point, he ordered his followers to turn to guerilla tactics to combat the American army. From this point on, the war became a savage, no-holds-barred guerilla conflict made up of ambushes, massacres and retribution. Both sides engaged in wanton violence and slaughter. Villages were destroyed, civilians murdered, prisoners tortured and mutilated along with a host of other atrocities. Many American officers and non-coms had served in the Indian Wars, and thus applied the old belief that "the only good Indian was a dead Indian" to their relations with the Filipinos. This attitude of course was reciprocated by the native forces.
Emilio Aguinaldo was captured in March, 1902, and organized opposition from his followers soon faded. Despite the official end to hostilities proclaimed on July 4, 1902, individual tribes in Luzon and the Muslim Moros of the southern islands launched further uprisings for another decade or so.
CONSEQUENCES OF CONFLICT:
1. Independence for the Philippines was delayed until 1946.
2. The United States acquired an overseas colony which served as a base for U.S. business and military interests in the Asia/Pacific region.
3. Following the conclusion of major hostilities, the U.S. did it's best to "Americanize" the Philippines. Through successful civilian administration, the Islands were modernized and the nation prepared for eventual independence. The Philippines became an independent nation on July 4, 1946.
CASUALTY FIGURES:
U.S.-- 4,234 dead and 2,818 wounded.
Philippines-- 20,000 military dead and 200,000 civilian dead. (approximate numbers). Some historians place the numbers of civilian dead at 500,000 or higher.
The Phillipine insurgency, not a pretty picture at all, is your best comparison. The post-war German "insurgency" is probably a non starter, at least if the folks at the Center for Military History know anything.