A counter-demonstrator squares off with immigrant rights supporters during a protest outside Wrigley Field before the start of the Cubs game against the Arizona Diamondbacks Thursday in Chicago. Dozens of people demonstrated outside the park calling for a boycott of the series to protest the passage of Arizona's controversial immigration law.
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James Wilkinson rose to the rank of brigadier general during the Revolutionary War, and after a break from military service was commissioned a major general in the War of 1812.
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Before he became the 26th president, Theodore Roosevelt (center) led the men of the 1st Cavalry Volunteers, known as the "Rough Riders," on San Juan Hill during the Spanish-American War in 1898.
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Afghan protesters shout anti-American slogans during a protest in Kandahar, Afghanistan, on April 12 after international troops opened fire on a bus carrying Afghan civilians, killing at least five people.
Researchers Evgenia Ilyinskaya and Asgerdur Sigurdardottir sweep up volcanic ash from a small bridge just south of the Eyjafjallajokull volcano. The ash will be taken back to the University of Iceland for analysis.