Since Demeter was the goddess of the seasons, basically, whenever Persephone was in the Underworld with Hades, it was winter. There was no autumn or fall in Ancient Greece. It was winter because Demeter was sad. Once Persephone returned, it would become summer and spring again because Demeter would rejoice.
The synonym that best describes a friendly competition is the word "Match: contest between two or more". Usually, the word "match" is used in sport games when a group of people or a team competes against each other to win a certain title. The word "battle" means war and already involves deadly weapons.
They can be seen in mountains
