Hepthalite–Kidarite Wars

The Hepthalite - Kidarite Wars refers to multiple military confrontations between the Kidarites and the Hepthalites which ultimately resulted in the decline of the Kidarite power in Central Asia.

Hepthalite expansion to Tukharistan
The Hepthalite expansion to Tukharistan caused the splitting up of Kidarites into two groups, one in Sogdia and second one in the south.

Hepthalite invasion of Sogdia
The Hepthalites gradually invaded and destroyed the Kidarite power in Sogdia, conquering this area.

Hepthalite - Kidarite War of 467
The Sassanian emperor Peroz lacked enough manpower to launch a full scale war against the Kidarites. Therefore, he sought peace with the Kidarites and offered them his sister in marriage but instead sent an imposter. The Sasanians allied with the Hepthalites in order to allign against the Hepthalites and eventually the Hepthalite - Kidarite War of 467 turned out to be the demise of the Kidarites.

Aftermath
The Kidarites suffering defeats against the Hepthalites and Sassanids pushed them out of Central asia and Bactria, which would eventually lead them to Gandhara and would come in conflict with the Guptas.