Armada Oil, Inc. formerly NDB Energy, Inc., is an oil and natural gas exploration and production company. It focuses on discovering, acquiring and developing multiple objective onshore oil and natural gas resources in prolific and productive geological formations in North America. Through its subsidiary, Armada Oil and Gas, Inc. it focuses to pursue projects located in Southern Wyoming. Armada Oil and Gas holds interests in Carbon County, Wyoming that include leasehold interests in 1,280 acres, and an option to acquire leasehold interests to an additional 23,700 acres, in the Niobrara and Casper formation project near existing infrastructure, which includes oil and natural gas pipelines, oil refineries and gas processing plants. On March 28, 2013, it announced the closing of the asset purchase agreement and completion of the business combination of Armada Oil Inc and Mesa Energy Holdings Inc. In completing the transaction, Armada Oil acquired 100% of Mesa Energy Inc.