I wonder how the King escaped our hands

Warwick
I wonder how the King escaped our hands.
York
While we pursued the horsemen of the north,
He slyly stole away and left his men;
Whereat the great lord of Northumberland,
Whose warlike ears could never brook retreat,
Cheered up the drooping army; and himself,
Lord Clifford, and Lord Stafford, all abreast,
Charged our main battle’s front and, breaking in,
Were by the swords of common soldiers slain.

This is the palace of the fearful king,
And this the regal seat. Possess it, York,
For this is thine and not King Henry’s heirs’.

Edward
Lord Stafford’s father, Duke of Buckingham,
Is either slain or wounded dangerous.
I cleft his beaver with a downright blow.
That this is true, father, behold his blood.
 He shows his bloody sword.
Montague, to York, showing his sword
And, brother, here’s the Earl of Wiltshire’s blood,
Whom I encountered as the battles joined.
Richard, holding up a severed head
Speak thou for me, and tell them what I did.
York
Richard hath best deserved of all my sons.
But is your Grace dead, my lord of Somerset?
Norfolk 
Such hope have all the line of John of Gaunt!
Richard
Thus do I hope to shake King Henry’s head.
Warwick
And so do I, victorious prince of York.
Before I see thee seated in that throne
Which now the house of Lancaster usurps,
I vow by heaven these eyes shall never close.
This is the palace of the fearful king,
And this the regal seat. Possess it, York,
For this is thine and not King Henry’s heirs’.
York
Assist me, then, sweet Warwick, and I will,
For hither we have broken in by force.
Norfolk
We’ll all assist you. He that flies shall die.
York
Thanks, gentle Norfolk. Stay by me, my lords.—
And soldiers, stay and lodge by me this night.
They go up onto a dais or platform.
Warwick
And when the King comes, offer him no violence
Unless he seek to thrust you out perforce.
 Soldiers exit or retire out of sight.
York
The Queen this day here holds her parliament,
But little thinks we shall be of her council.
By words or blows, here let us win our right.
Richard
Armed as we are, let’s stay within this house.
Warwick
“The Bloody Parliament” shall this be called
Unless Plantagenet, Duke of York, be king
And bashful Henry deposed, whose cowardice
Hath made us bywords to our enemies.
York
Then leave me not, my lords; be resolute.
I mean to take possession of my right.
Warwick
Neither the King nor he that loves him best,
The proudest he that holds up Lancaster,
Dares stir a wing if Warwick shake his bells.
I’ll plant Plantagenet, root him up who dares.
Resolve thee, Richard; claim the English crown.
 York sits in the chair of state.