Counters for Specific Combination of Units

As the title says, I am very eager in knowing about the specific unit combos' counters!

I want to learn a generic civ's unit counter or combo counter to a specific combo!

• Camels + Archers
• Camels + Skirms
• Knights + Skirms
• Pikes + Skirms
• Eagle Warriors + Pikes
• Mangonels + Pikes

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The map can be anything, but I am most interested in knowing about the counters in open maps such as Arabia.

Thanks in advance.