Annual dry season offensive is a type of low intensity warfare typically practiced by national governments against ethnic insurgent groups fighting for independence or autonomy.
This type of warfare usually occurs in countries with poor transportation infrastructure and a climate that makes fighting battles or even holding territory during parts of the year very difficult.
The governments of Myanmar[1] and Sudan[2] have engaged in annual dry season offensives in the 21st century.
At the end of the offensive, the army gives back all of the territory taken and returns to its base areas until the next dry season.
It is often used against groups that demand independence from a government and have a large base of local ethnic support.