The Battle of Porytowe Wzgórze (Porytowe Hill) -- Polish & Russian Partisans (about 3,000) defeated a German Combined Arms Force (25,000 - 30,000)

 via Wikipedia

On 14 June the Polish and Russian partisans, numbering around 3,000 in total, found themselves tightly surrounded by German forces. The German units consisted of between 25,000 and 30,000 soldiers, with artillery, tanks, armored cars and air support.

After an artillery and mortar barrage, the Germans managed to make two breaks in the partisans' line of defense. However, these attacks were eventually driven back, although at a high cost to the Poles and Russians. The Germans, relying on their superior numbers and armaments, managed to take control of a small wood nearby from which they could keep the partisans under constant fire, causing high casualties among them. Using this as a base for further attacks, German forces managed to seize the western side of the Porytowe Hill which breached the main line of defense. However, the Poles and Russians soon counterattacked, recovered the lost positions and, that night (of 14 June), made an attempt to break out from the trap. The main columns of partisans, after fierce fighting, many casualties and a forced 40 kilometer march, managed to reach the relative safety of the Solska Forest.

Partisan casualties were about 170, including around 100 killed and 70 wounded. 495 Wehrmacht soldiers also died, as well as an unknown number of German police and auxiliary forces.

Here 

Everyone, myself included, always searches the major battles that happened in WW2.  Additionally the emphasis is always on the Western Front.  Outside of the battle at Kursk and Stalingrad, we in the West tend to ignore that front.

That's a mistake and an educational bias that I believe even infects our military professionals to a degree (I've always wondered why the US has historically had a terrible time fighting in Asia, but for some reason Western Forces always do badly in that region....after WW2 that is and that was meatgrinder, bomb it till you start tilling the soil and then bomb some more).

I stumbled across this battle and have to know more.  Follow the link and read what's there but this thing is fascinating.

Even with the follow on operation Partisans escaped and they gave as good as they got with regard to body count.

Anyone know a good book on the Partisan fight on the Eastern Front?