(S (S (SBAR (WHADVP (WRB When)) (S (BASENP (PRP they)) (VP (VBD tried) (S (VP (TO to) (VP (VP (VP (VB put) (PRT (RP up))) (BASENP (DT a) (NNP Canadian) (NNP Flag))) (PP (IN across) (PP (IN from) (BASENP (NNP DCE) (NN property)))))))))) (S (BASENP (DT the) (NNP OPP)) (VP (VP (VP (VBD sent) (PRT (RP in))) (BASENP (NN 100) (NNS officers))) (S (VP (TO to) (VP (VB stop) (BASENP (PRP them)))))))) (PERIOD .))