On 17 July 1936, within the operations of the coup that started the Civil War, he joined the group of young militants of the monarchical party, led by Carlos Miralles, and on the orders of General Mola, occupied the port Somosierra on 4 January with the aim of facilitating access to the Madrid columns from the north so they could take the capital.

During the Civil War, Satrústegui, who had performed military service in the militia university and obtained the degree of lieutenant, became captain of a complement within the ranks of the Nationalist faction.

Wishing to restore the monarchy in the person of Juan de Borbón, after 1940, once the war was over, he opposed Franco, for which was fined and arrested several times.

He ran in the municipal elections in Madrid on 21 November 1954, won by Joaquín Calvo Sotelo, Juan Manuel Fanjul and Torcuato Luca de Tena, but their auditors were expelled from polling with the regime fearing their victory.

He participated in the so-called Munich conspiracy in May 1962, so he was banished for almost a year in Fuerteventura, along with Jaime Miralles and Fernando Alvarez de Miranda, among others.