"OO" sorry

By anonymous. Each correct response will [b]end[/b] with the letters "O-O".

(3/-1) In 1815, a coalition led by Wellington and Blucher ended Napoleon's military career at this Belgian battle.9900
(6/-2) This 7-letter word can refer to an imaginary source of fear or a Dutch company that makes infant strollers.79119
(9/-3) Let’s celebrate this unofficial nickname given to a person affiliated with the University of Virginia.44847
(12/-4) These 2 words complete the title of Rick Derringer’s 1973 classic rock staple “Rock and Roll, …”40851
(15/-5) The headquarters of Nokia and Rovio Entertainment can be found in this 2nd-largest Finnish city.28170

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