How did the central powers and the allies try to break the deadlock caused by trench warfare?

They started more war fronts and then tried Ariel attacks.

Explanation:

The trenches were an invention during the time of the first world war when the soldiers began to dig into the fields and fight from them instead of open pitched battle which was common in the time.

The trenches were thus marked as the end of the fast paced war as both forces had defensive portions on the turf.

This was to be worked around by using more war fronts to surround and bypass the trenches as well as ways to mount the other trenches and overtake them.

1. darius the great     persia  

2. piankhi       nubia

3. ezana       aksum

4.     nebuchadnezzar     babylonia

5. shalmaneser iii     assyria

1. it was caused by feudalism

2. charlemagne used christianity as a major cornerstone for his rule. cloisters were built all over the empire to act as centers for the (re)population of the vast european wilderness.

3. the europeans feared the next raid every time chetak

i'm not so sure about #6. but i hope i you with the first 3.