grenades currently have a 50% damage penalty against units in garrison, so they are not an effective solution to infantry in building.
Most decent player will be able to dodge grenade anyway. It's not a reliable solution.

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96 | ||
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32 | ||
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27 | ||
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17 | ||
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307 | ||
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68 | ||
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47 | ||
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6 | ||
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4 |