The single currency rallied yesterday on active cross buying in euro especially versus the Japanese yen and price briefly penetrates 1.3796 today, confirming the erratic upmove from this month's low of 1.3433 to retrace medium-term downtrend has resumed and further gain towards previous daily resistance at 1.3840 would be seen, however, reckon 1.3870/75 should cap upside and bring retreat later.  
On the downside, only a breach of yesterday's NY support at 1.3717 would signal a top is made and bring stronger pullback to 1.3639/57 support area.