I think you are talking about Croatia. Mongols suffered a rare defeat but nothing like the ones they dished out. They still burned and pillaged Coratia. Mamluks gave Mongols a hard time later and Japanese defeated Mongols.
Conquest of Rus' lands:
- Mongol losses: About 7,000.
- Rus' losses: About 500,000, or 6~7% of entire population.
Invasion of Poland:
- Defeated alliance of Poland and various allies including Silesia.
- Mongol casualties, minimal.
- "Trouble" you mentioned may have been a surprise attack made by left over Cracovian knights, that was shortly defeated while they were too distracted with loot.
Invasion of Hungary
- Crushed Hungarian/TO/Knights Templar army, killed HALF of Hungarian population.
Western Europe was on the verge of being conquered but then Genghis Khan died so all the army retreated.
Mongols did have the advantage in technology at the time. They had gunpowder with bombs hurled via catapults during sieges. Mongols are often credited for introducing gunpowder into Europe.