For the hundreds of thousands of migrants on the move across Europe, the pace of a day is dictated by forces almost entirely beyond their control: the heat of the sun, the location of guards or police, the reliability of a cellphone signal.

The bare earth often serves as their bed and table, but they rarely know when or where the next sleep or meal is coming from.

From the bridge of a naval ship in the Mediterranean, whose crew hopes to rescue people who have made the dangerous journey by sea, to the northernmost tip of France, where hundreds await a chance to go to England, Associated Press photographers captured 24 hours of a crisis that shows no sign of ending.

In just one day, Hungary's main international train station descended into chaos, two ferries carrying 4,000 migrants left the tiny, overwhelmed Aegean islands where the migrants first came ashore and headed to the Greek mainland, and 1,200 people were rescued at sea.

Tuesday was punctuated by quiet moments as well: new arrivals in Vienna trying to get their bearings outside the train station, a shared dinner, a French grammar lesson.

Germany, where lines were orderly, expects to receive 800,000 refugees this year. Hungary, which says 150,000 have already arrived, abruptly refused to allow thousands to board northbound trains in Budapest, turning the area outside the station into a makeshift camp by nightfall.

Here is a glimpse of one day along the migrant trail in Europe.