There, in 1933 at the Roßleben Monastery School he did his Abitur. After his Abitur, Hayessen completed military training at Artillery Regiment no. 12 in Schwerin as a career officer and rose to major on the General Staff with General Friedrich Fromm, Commander-in-chief of the Reserve Army.
In 1933 at the Roßleben Monastery School, he completed his Abitur. Following this, Hayessen underwent military training at Artillery Regiment no. 12 in Schwerin as a career officer and eventually became a major on the General Staff under General Friedrich Fromm, Commander-in-chief of the Reserve Army.