1.   The enemy had mined the harbor.

2.   President Nixon bombed Haiphong and mined its harbor confident that Leonid Brezhnev would not let that action interfere with an upcoming Moscow summit.

3.   In Nicaragua, they mined the harbors and armed the Contra rebels during the administration of former President Ronald Reagan.

4.   In Nicaragua, they mined the harbors and armed the Contra rebels during the Reagan administration.