The mother lion was brutally attacked by a mad buffalo while rescuing her cubs.

The lion family is playing together on the green grass. The mother lion is teaching her cubs how to adapt to life and giving them training on how to hunt for prey.

Lion vs Buffalo Battle is not never | Buffalo Too Angry Destroy The  Strongest Lion in African - YouTube
A herd of buffalo was grazing nearby, the cubs were allowed to roam freely in the grasslands by their mother, but they approached the buffaloes. It seems that the lion cubs have not adapted to the danger of not having their mother around, so they have taken actions to make the buffalo angry.

Lions hunting Water Buffalo | Lion hunting, Animals, Animal tatoos
The buffaloes saw the ridicule of the young buffaloes, so they got angry and chased after the cubs with a fierce face, as if it would use its horns to knock the young lions up.
From a distance, the mother lion saw her cubs and quickly ran to rescue them.

buffalo too late to rescue his friend from lion - king of lion run away  from buffalo - lion, buffalo - YouTube
Before the aggressiveness of the buffalo, the mother lion was seriously injured when rescuing her innocent cubs.