What do you mean by peaceful harvests?(from poem No Men Are Foreign)

Dear student,
In the poem, No Men are Foreign, the poet has tried to portray the difference between times of war and times of peace. When there is no war going on, people of a country feel safe and at peace. Shortage of food is definitely not something, they need to face during the times of peace. So, by the term, peaceful harvests, the poet has actually tried to hint at the calm and peaceful environment people enjoy during the period of peace. 
Regards.