(S (S (S (BASENP (NNS Troops)) (VP (VP (VBD fought) (PP (IN with) (BASENP (NNS militants)))) (PP (IN for) (BASENP (QP (RB over) (NN two)) (NNS hours))))) (SBAR (IN after) (S (BASENP (NNS militants)) (VP (VBD ambushed) (NP (BASENP (PRPD their) (NN convoy)) (PP (IN of) (BASENP (NN 40) (JJ armored) (NNS vehicles)))))))) (PERIOD .))