June, 1915 - Joined the Russian army, assigned to the 1st Aviation Group in Petrograd.
Completed the aviation theory courses, then sent to Moscow for flight school.
1917 - Temporary posting to France to attend the Farman flight school (and others) and earns the highest level of pilot qualifications.
At the end of 1917 he returns to Russia and receives a promotion in rank.
May 9, 1919 - serving in Zemgale for the bolshevik air force, he flies over to the German side.
June 28, 1919 - he transfers to the Latvian military aviation unit. Rank: Sargeant
July 22, 1919 - ordered to form the first squadron, with himself as Commander.
July 29, 1919 - Assigned to commission overseeing acceptance of war trophy aircraft
August 5, 1919 - makes the first flight of the Latvian air force in his Nieuport.
August 25, 1919 - Prieditis flies the Nieuport for a half hour on a familiarization flight.
August 27, 1919 - Prieditis makes the second offensive sortie patrolling Krustpils-Livani-Cargrade-Krustpils.
He dropped 7 bombs flying at an altitude of 900 metres for one hour and 10 minutes. The aircraft received bullet holes in three places.
He ran out of gas and had to glide back to the aerodrome.
1919 - promoted to the rank of 1st Lieutenant.
October 15, 1919 - distinguished himself in a particularly difficult 90-minute flight over
the enemy near Daugavgriva. He dropped bombs, scattered the enemy, and made tactical observations.
(Noted in his Order of Lacplesis citation)
October 18, 1919 - appointed commander of the 1st Squadron.