This seemed quite straight forward at first but there a couple of words I could not trace
 
63. kafli

Nú eggjar Starkaður sína menn. Snúa þeir þá fram í nesið að þeim.
Now Starkað urges on his men. They turned off up the headland toward them (Gunnar & Co)
 
Sigurður
svínhöfði fór fyrstur og hafði törguskjöld einbyrðan en sviðu í annarri
hendi.
Sigurð Swinehead was first up (lead) and had a round shield, in one hand and a cutlass/spear in the other (Weapon(Z) gives spear/cutlass - meaning seems unclear)
 
Gunnar sér hann og skýtur til hans af boganum.
Gunnar sees him and shoots at him with the bow (shoots an Arrow)
 
Hann brá upp við
skildinum er hann sá örina hátt fljúga og kom örin í gegnum skjöldinn og í
augað svo að út kom í hnakkann og varð það víg fyrst.
He (Sigurð raises his shield when he saw the arrow fly, but the arrow came through the shield and (into) his eye and came out at his neck and that was the first kill.
 
Annarri ör skaut
Gunnar að Úlfhéðni ráðamanni Starkaðar og kom sú á hann miðjan
Another arrow Gunnar shot at Ulfheðin (Wolfcoat) - Starkað's Steward (or(Z) overseer) and came to him (hit him) in the middle (in the waist)
 
og féll hann
fyrir fætur bónda einum en bóndinn féll um hann þveran. Kolskeggur kastar
til steini og kom í höfuð bóndanum og varð það hans bani.
And he fell at the feet of a farmer (einum - one of them) and he (the farmer) stumbled across him.  Kolskegg cast a stone that struck the head of the farmer and that was his bane (killed him - it was a large stone)

Þá mælti Starkaður: "Ekki mun oss þetta duga að hann komi boganum við og
göngum að fram vel og snarplega."

Then spoke Starkað  "It is not helping (duga)  us that he can come at (the use of) his bow - now we go forward - well and quickly (CV - with a dash)
 
Síðan eggjaði hver annan. Gunnar varði sig með boganum meðan hann mátti.
Then they urged one another on. Gunnar defended himself with (his) bow as long as he was able

Síðan kastaði hann niður boganum. Tók hann þá atgeirinn og sverðið og vegur
með báðum höndum. Er bardaginn þá hinn harðasti. Gunnar vegur þá drjúgan
menn og svo Kolskeggur.
Afterwards he cast away his bow.  He took then the Halberð and the sword and fought/killed with both hands. It was a battle day (bar + dag) that was most fierce Gunnar killed (many/several) men and the same (did) Kolskegg

Þá mælti Þorgeir Starkaðarsonur: "Eg hét að færa Hildigunni höfuð þitt
Gunnar."
Then said Thorgeir Starkað's Son "I vowed to obtain for Hildegun - your head Gunnar"

"Ekki mun henni það þykja neinu varða hvort þú efnir það eða eigi," segir
Gunnar, "en þó munt þú nær ganga hljóta ef þú skalt það meðal handa hafa."
"Neither must she think any (G) worth (of it)" Says Gunnar "and you must come near (closer) if you would (if you shall ?) have it in your hands (actually = between your hands)

Þorgeir mælti þá við bræður sína: "Hlaupum vér að honum fram allir senn.
Hann hefir engan skjöld og munum vér hafa ráð hans í hendi."
Thorgeir spoke then to his brothers "We shall rush upon him all (senn) at the same time/together. He has no sheild and we have his fate in (our) hands

Þeir hljópu fram Börkur og Þorkell og urðu skjótari en Þorgeir.
They ran/leaped forward,  Bork and Thorkell and they were quickly (Z) ahead of Thorgeir
 
Börkur
höggur til Gunnars. Gunnar laust við atgeirinum svo hart að sverðið hraut úr
hendi Berki.
Bork slices.hews at Gunnar. Gunnar struck (MM&HP - parried) with halberð so hard the sword flew (?) from Bork's hands (from his grasp)
 
Sér hann þá til annarrar handar Þorkel standa í höggfæri við
sig.
He sees  there on another side - Thorkell within sword's reach (CV) of himself
 
 
Gunnar stóð nokkuð höllum fæti. Hann sveiflaði þá til sverðinu og kom á
hálsinn Þorkatli og fauk af höfuðið.
Gunnar turned on his feet (MM&HP - pivoted)
He sliced at him with his sword and struck upon Thorkell's neck and his head
flew off (MM&HP)
 
Fauk I could not find and since MM&HP say flew off I tried looking at fljuga but the word fauk - specifically - was not there
 
Any critique - corrections and stuff will be warmly welcomed
Kveðja
Patricia