The axe fight between Matson and APL is headed to the courts.

In a suit filed in Washington, DC federal court Tuesday, the Hawaiian containership owner alleges the US Department of Transportation and the Maritime Administration are unlawfully providing subsidies to the CMA CGM subsidiary, helping to crater Matson's Guam service.

APL is not a party in the lawsuit, but the lawsuit seeks to strip subsidies from two of its boxships.