You need to "drop" the ninja or emmissary on an enemy unit or castle, just like you do when you unite armies. The ninja will then get the task to kill the general or daimyo, the emmissary will offer an alliance and so on...

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CD-Recommendation:
Miles Davis the complete live at the plugged nickel 1965

[This message has been edited by UncleLou (edited 01-18-2001).]