Page "Sontaran" Paragraph 16
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It would not be until The Sontaran Stratagem that General Staal would show that the baton can fire an orange beam that could stun the target.
In The Invasion of Time, their armour is shown to be resistant to Time Lord stasers and K-9's blaster.
However, their armour is vulnerable to standard human firearms in " The Poison Sky ", but the Sontarans in that episode used a ' cordolane signal ' which caused the copper-lined bullets to expand, jamming most firearms instantly.
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