It's a false chocolate chip cookie propaganda, go back to school 
lol... I learned that at school...loooong time ago ! Now I m teacher and I go to school everyday...
For historical I will try to translate in frenglish :
Poland cavalry was not with lance...Lance was only for "parade". In war they were just like mounted light infantry. they ride quickly and tried to destroy tanks with Molotov coktails and magnetic hand grenades...
In 1939 cavalry charges were rare against german troops and only for little groups of soldiers.
Best exemple was the charge by the Colonel Mastalerz against Guderian germans infantery divisions in Danzig corridor. It was real success in beginning but german vehicules came and destoryed the cavalry.
When German and italian reporters came at the battlefield and saw the horses and the tanks they wrote on newspapers "suicide cavalry charge against tanks" and it was used by propaganda later...
In 1941 against Soviet and German troops charges were more frequent : For exemple in November 1941 the charge of mongol cav division was exterminated by german machinegun : 2.000 horses killed for only 30 who reach the german objective...massacred...
Very usefull to know the poland army in WWII :
http://www.polishforums.com/history-poland-34/polish-military-in-pictures-38822/ By now, please take time to learn more before writing "go back to school"... Sometimes you don't know very well who is your interlocutor and what was the reality of facts... thank you for attention...
PS : Poland Cavalry didn't cheat in WWII...so they loose....
