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Brightenings observed in the solar extreme-ultraviolet (EUV) images aregenerally interpreted as signatures of micro- or nanoflares occurring at thetransition region or coronal temperatures. Recent observations with the ExtremeUltraviolet Imager (EUI) on board Solar Orbiter have revealed the smallest ofsuch brightenings (termed campfires) in the quiet-Sun corona. Analyzing EUI 174{\AA} data at a resolution of about 400 km on the Sun with a cadence of 5 sfrom 30-May-2020, we report here a number of cases where these campfiresexhibit propagating signatures along their apparent small (3-5 Mm) loop-likestructures. Measured propagation speeds are generally between 25 km s$^{-1}$and 60 km s$^{-1}$. These apparent motions would be slower than the local soundspeed if the loop plasma is assumed to be at a million Kelvin. Furthermore,these brightenings exhibit non-trivial propagation characteristics such asbifurcation, merging, reflection and repeated plasma ejections. We suggest thatthese features are manifestations of the internal dynamics of these small-scalemagnetic structures and could provide important insights into the dynamicresponse ($\sim$40 s) of the loop plasma to the heating events as well as intothe locations of the heating events themselves.

Propagating brightenings in small loop-like structures in the quiet Sun corona: Observations from Solar Orbiter/EUI