Answer:
By the year 1000, the place that the Muslim armies had attacked but not conquered was Tours and Constantinople.
When was Constantinople first attacked by the Muslims?
The City of Constantinople was first attacked by Muslim armies between 674 - 678 even though Constantinople did not fall.
As the Muslims pushed into Europe from Spain, they attacked the city of Tours before 1000 AD and they were defeated and forced back into Spain.
Step-by-step explanation: