What about Dwight D. Eisenhower's clever strategy on D-Day?
After years of holding Americans hostage in Iran during Carter's administration who even had aborted attempts to rescue them, immediately after Ronald Reagan becme President, he cleverly sent innuendos to Iran that there would be serious repercussions if it did not release these hostages. The hostages were quickly released.
George Washington was very clever in his strategy at the Battle of Trenton.It was Christmas 1776 and morale was low among his soldiers. Washington needed a win, to insure the survival of the cause as well as boost the morale of his troops. Knowing that the Hessian troops (German mercenaries) would have celebrated Christmas with food and spirits, Washington waited until they all were asleep and implemented his cleverness. His troops crossed the Delaware and simply went on a surprise attack. Gambling on the state of mind of the hungover Hessions, Washington was able to secure a win and boost morale at the same time.
Just a few people that come to my mind are:
Ghandi, who protested the British in India
Martin Luther King, Jr, who fought for Civil Rights
Harriet Tubman, who risked her life repeatedly to help slaves escape bondage
Franklin D. Roosevelt, who got our country through some incredibly hard times with lots of creative thinking
There are so many important historical figures that became clever in times of crisis. That's often why they are remembered and famous! In order to think of more people, search for historical figures in time of strife or war, and research how they used some clever problem solving to work towards getting out of hard times or situations.