I was talking about Lithuanian-Polish Commenwealth. These wars were tactical they were not religious. They had not terrorist character. Muslims were not fighting because of religion. They were not using religious slogans. I am sorry you missed the point completely. We are not talking about a war but religious war. In that sense these communities have been living in peace in the period emphasized by me. Read please, if you can, God’s Playground by Norman Davies.
For several hundred years the Tatars raided almost yearly deep into Ukraine, Muscovy, Poland, Lithuania and the Danubian area.
These raids were launched specifically against Christian peoples, which the Muslim Tatars viewed, in agreement with Muslim orthodoxy, as their legitimate prey.
You may not consider this terrorism, but I suspect the people most affected would have disagreed. Estimates vary wildly, but range upwards of 3M captured and sold into slavery, with many no doubt killed in the process not included in these numbers.
The Tatars themselves considered their raids to be jihad. Modern terrorists consider what they do to be jihad.
Since the harvesting of the steppe was aimed intentionally at civilians, not with the goal of defeating armies or conquering territory, it seems to me to pretty clearly meet most of the criteria for what we today call terrorism.