X0306 4 2013-05-18 0 0000813779 CRIMSON EXPLORATION INC. CXPO 0001322940 Mengle Jay S C/O CRIMSON EXPLORATION INC. 717 TEXAS AVENUE, SUITE 2900 HOUSTON TX 77002 0 1 0 0 Senior VP - Engineering Common Stock 2013-05-18 4 F 0 3695 3.03 D 336211 D Withholding of stock to satisfy tax withholding obligations. This Form 4 has been signed by John A. Thomas, Secretary of Crimson Exploration Inc., on behalf of Mr. Mengle, pursuant to an instrument of Power of Attorney, dated July 25, 2011. The authority granted pursuant to such instrument is to remain in effect until rescinded in writing by Mr. Mengle. /s/ John A. Thomas 2013-05-20