The climax of the marching season - the celebration of the Battleof the Boyne - was approaching.
BBC: Northern Ireland: An historic year
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They had previously warned that bigoted behaviour and drinking in public would "not be tolerated" during the events to mark the Battleof the Boyne in 1690.
BBC: Orange parades 'pass peacefully'
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The marches, commonly referred to as the Orange Walk, are celebrations which mark Prince William of Orange's victory over King James at the Battleof the Boyne in 1690.