Locked in a bitter environmental lawsuit in Ecuador, Chevron Corp. has unleashed an arsenal of potentially potent new weapons in the case - private documents written by the other side's lawyers. Working through U.S. courts, the oil company has subpoenaed and made public an astonishing array of e-mails and letters written by the legal team suing Chevron over oil-field contamination in northeastern Ecuador…Chevron considers the documents a series of smoking guns…The plaintiffs' legal team insists that its conduct in the case has been legal and appropriate under Ecuadoran law…"The comments were all born out of a frustration with Chevron's efforts to undermine the trial in Ecuador," said Karen Hinton, spokeswoman for the plaintiffs' lawyers. [also refers to Texaco, Petroecuador]