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In page Reactive armour:

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The earliest trials were done with small charges able to defeat 2 inches of steel plate which were readily defeated by a layer of explosive (Baratol, R.D.X., Cordite, etc.) or a vigorous oxidising medium. Subsequent trials with British No.68 and American M9A1 grenades were carried out. Only a limited number of trials were conducted, causing varied results.[citation needed]