Question: Where in Denmark was Heinrich Holk a mercenary?

Context paragraphs:
Kronborg: Kronborg is a castle and stronghold in the town of Helsingør, Denmark.  Immortalized as Elsinore in William Shakespeare's play "Hamlet", Kronborg is one of the most important Renaissance castles in Northern Europe and has been added to UNESCO's World Heritage Sites list (2000).

Ekensund Artists' Colony: The Ekensund Artists' Colony (German - "Künstlerkolonie Ekensund") was a late 19th century art colony in Egernsund Sogn, now in southern Jutland on the north bank of the Flensburg Firth in Denmark, but then known as Ekensund and part of the Province of Schleswig-Holstein within the German Empire.  It drew artists including Wilhelm Dreesen, Alexander Eckener, Otto Heinrich Engel, Johannes Knutz, Erich Kubierschky, Jacob Nöbbe, Heinrich Petersen-Angeln, Johann Sander and Fritz Stoltenberg.

Johann von Geyso: Johann von Geyso (1593 – 1661) was a German nobleman and General-Lieutenant, who fought during the course of the Thirty Years' War.  After studying in a Dutch military academy, Geyso fought as a mercenary in the armies of Sweden, Bohemia, Denmark and the German Protestant Union.  In 1628, having gained significant experience in warfare he returned to his native Hesse-Kassel which he served until the end of the Thirty Years' War, reaching the rank of commander in chief of the Langraviate's forces and becoming ennobled.

First Breath: First Breath is the first album released by the band Mercenary.  With this album, "Mercenary" showed their death metal roots.  "First Breath" was recorded at the Aabenraa Studio, Denmark.

Heinrich Holk: Heinrich Holk (also Holke or Henrik Holck) (April 18, 1599 in Kronborg castle, Denmark – September 9, 1633 in Troschenreuth, Vogtland) was a Danish-German mercenary in both Christian IV of Denmark's and Albrecht von Wallenstein's service during the Thirty Years' War.

Mercenary (band): Mercenary is a melodic death metal band from Denmark, that was formed in 1991.  The band incorporates a lot of power and progressive elements in their songwriting.

Charles Frederick Henningsen: Charles Frederick Henningsen (1815 – 14 June 1877) was a writer, mercenary, filibuster, and munitions expert.  He participated in civil wars and independence movements in Spain, Nicaragua, Hungary, and the United States.  He was born in Brussels His father was John Henningsen (1775-1859), a native of Copenhagen, Denmark, and his mother was Louisa Burke (1789-1842), an Irish heiress.  However, being adventurous in his youth, he revered Lord Byron in both literature and adventure, and so idealized British nobility in his actions.  The family lived in Brussels from at least the time of his birth until the onset of the Belgian Revolution, fleeing due to their pro-Dutch sympathies.  The family fled first to Paris, then to London.  One of his sisters was Josephine Amelie de Henningsen (1822-1904), becaming a member of the Missionary Sisters of the Assumption, who established the order in South Africa in 1849.

A.H. Riise: Albert Heinrich Riise (September 11, 1810 in Ærøskøbing, Denmark – October 18 1882, at Frederiksberg, Denmark) was a Danish pharmacist and manufacturer.

Christian Heinrich Heineken: Christian Heinrich Heineken (February 6, 1721 – June 27, 1725), also known as "the infant scholar of Lübeck", was a mythical German child prodigy.  It is said that when he was eight weeks old, he could speak German.  He read the Pentateuch at age one, and between the ages of two and three, he read the Old and New Testament in Latin.  When he was three years old, he was said to have authored "A History of Denmark" and recited it when visiting the King of Denmark later the same year.  He died at age four of celiac disease.

Emiliekilde: Emiliekilde is a memorial located at the corner of Strandvejen and Emiliekildevej in Klampenborg, Gentofte Municipality, in the northern suburbs of Copenhagen, Denmark.  It was installed by Ernst Heinrich von Schimmelmann to commemorate his first wife, Emilie Caroline, who had recently died of tuberculosis.

Supporting paragraphs: Heinrich Holk Kronborg
Answer: Helsingør