Tscherning rejoined the army in 1828. He was almost at once sent with a few fellow officers, including Christian Frederik Hansen and Otto Schlegel, to observe the French expeditionary force that had been sent to provide support in the Greek War of Independence. Not for the first time in his military career, by the time he arrived the fighting was over. The Egyptian troops had left. He nevertheless had the opportunity to join in, as a volunteer, with some fortification construction and other organisational work. He returned in 1829, stopping off for a period of further study in France before moving on, back to Copenhagen.