Final Answer:
The Crusades, were a series of military expeditions from parts of Europe to the Eastern coast of the Mediterranean.
Step-by-step explanation:
The original phrase is completed with "military expeditions." This phrase accurately reflects the historical context of the Crusades, which were a series of military campaigns.
From Parts of Europe: This part indicates that the Crusaders originated from different regions in Europe, highlighting the multinational nature of the Crusades. It involved knights, soldiers, and civilians from Western European countries.
To the Eastern Coast of the Mediterranean: The Crusades were targeted at reclaiming or securing control over key holy sites in the Eastern Mediterranean, particularly Jerusalem, which was a significant religious and cultural center.