Meanings of determine thenceforth in English

Excuses were made for not giving it up, and the General determined thenceforth to continue the warfare with vigour and punish this atrocity.

I revolved these circumstances in my mind, and determined thenceforth to apply myself more particularly to those branches of natural philosophy which relate to physiology.

He determined thenceforth to "stand up" for Benjamin, and began to plan some way of making a return for his manifestation of good feeling.