In August 1936 he commanded one of the four Nationalist columns that took Badajoz by storm.
[1] He was present at the subsequent relief of Toledo and was wounded in the fighting around Madrid.
Castejón was given command of the 102nd division of the Army of Andalusia during the Battle of the Ebro.
From 1939 to 1942, he commanded the Tercio «Duque de Alba» of the Spanish Foreign Legion.
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