We were looking for Spain's longest river. The answer is the Ebro River. The battle of the Ebro was one of the last during Spain's Civil War.

Erbo River

Americans took part. They were part of the international volunteer brigades that supported the Republicans in the fight. The Republicans were battling General Francisco Franco's Nationalists for control of Spain.

The American volunteers were led into battle by Milton Wolff. Mister Wolff died in California earlier this week. He was 92.

Peter Carroll is chairman of the Lincoln Brigade Archives -- a group that chronicles the lives of American veterans of the Spanish civil war.

He's in Palo Alto, California.

Listen